United States Air Force (USAF) has left a significant phase in the future bomber project. In the last days of November, B-21 weapon system design parameters were reviewed. While assessing the capabilities of the aircraft during the evaluation activities, USAF studied to determine possible risk factors. As a result of multidisciplinary technical evaluation studies, it was decided that the B-21 program would mature enough at the expected level and the program could resume. B-21 Raider, whose deliveries are expected to start in the 2020s, are being developed to make in-deep strikes on the heavily protected areas by air defence systems. The development of the platform, which will have reduced radar cross-sectional design, is under the responsibility of the Air Force Rapid Capabilities Office.